Solve.The function h = -16t2 + 16t + 252 gives the height h, in feet, of a coin tossed upward from a balcony 
high with an initial velocity of 
During what interval of time will the coin be at a height of at least 
A. 4 ? t ? 8
B. 3 ? t ? 4
C. 0 ? t ? 4
D. 0 ? t ? 1
Answer: C
Mathematics
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Simplify. Write your answers in the form of a+bi, where a and b are real numbers.
A. - 
+ 
i
B. 
i
C. - 
D. - 
- 
i
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Solve.The product of a number and 5 is four times the sum of that number and 10. Find the number.
A. 4 B. 10 C. 40 D. 45
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Find the standard form of the equation of the ellipse with the given characteristics.
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Use the given feasible region determined by the constraint inequalities to find the maximum possible value of the objective function.f = 7x + 6y subject to the constraints 
A. 385 B. 405 C. 231 D. 275
Mathematics